Striped schoolers whose marks help neighbors keep pace
Mackerel names many open-ocean fishes, mostly in the tuna family Scombridae, with forked tails and tiger-like back stripes. They lack swim bladders, retract fins into grooves, and haul huge commercial landings—over five million tons in 2009—while oily flesh packs omega-3 fats that spoil fast in the tropics.
Roughly thirty-plus species share the label, with about twenty-one in Scombridae and Atlantic mackerel (Scomber scombrus) as the type. True mackerels form tribe Scombrini with seven species in Scomber and Rastrelliger; Spanish mackerels fill cousin tribe Scomberomorini. Extra “mackerels” appear among jacks, greenlings, and snake mackerels. The English word traces to Old French senses of spotted or, oddly, procurer—perhaps because shoals spawn so vigorously nearshore.
Pelagic stripes are not background camouflage. Denton and Rowe argued in 1998 that reflecting platelets on some bands telegraph orientation changes so schoolmates can match speed, aided by the lateral line. Atlantic mackerel sustain about 0.98 m/s and burst to 5.5 m/s; wahoo may hit roughly 78 km/h. Females broadcast 300,000 to 1.500,000 floating eggs; larvae eat zooplankton, adults take copepods, shrimp, and squid, and predators from tuna to Bryde’s whales follow the schools.
Chub mackerel supply about half of scombroid catch, and together with Atlantic mackerel roughly three-quarters. Chilean jack mackerel is the heaviest non-scombroid take and has faced overfishing. Southeast U.S. king and Spanish stocks crashed in the 1980s, then recovered by 2001 after size limits and Florida gillnet bans. Before canning, English writers complained endlessly of stinking fresh fish, while French pickling with heavy salt spread sales inland. A 1976 British survey found fewer than ten percent of housewives had ever bought mackerel.
Source: Mackerel
